Malicious PDF — malware analysis report

Static analysis result for SHA-256 498d4cce6b1b90e9…

MALICIOUS

PDF

75.6 KB Created: 2021-09-20 21:15:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0f2ab57e5adff1288e9975e2574067f3 SHA-1: e96bc0e6b5cff16f35f6f47e0723de53aef9a52c SHA-256: 498d4cce6b1b90e987626496865be79be6b9ffe8a947c20b4e9a64255ad5c3a3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised WordPress sites and disposable domains, likely for phishing or malware distribution. The presence of embedded URLs and the 'SE_DOWNLOAD_BUTTON' heuristic suggest a lure to trick users into clicking and downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://philabc.ru/uplcv?utm_term=fast+and+furious+9+english+download PDF link annotation
    • https://fix2go.info/userfiles/file/26410873622.pdfIn PDF document text
    • http://sfalojistik.com/userfiles/file/ruzalexogezugiluf.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/bonumonen.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202109161210202049.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/lapulemoperinew.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/guwozagikoniregotegajazak.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/vuvuzulokeretixiz.pdfIn PDF document text
    • https://jf-orvalho.pt/userfiles/file/54891814180.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/161433381351ee---babalulepewonamo.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/87649394451.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614271a380680---vifaxefezelarefinelisog.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/23966029870.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/85370195145.pdfIn PDF document text
    • https://edusfera.pl/upload/file/wekok.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/48099358662.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/motusetevidiromil.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/pudinusawuzid.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/zojezavunidoranef.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210911075531_ltdz4a.pdfIn PDF document text
    • http://patanjali.zohukum.com/ckfinder/userfiles/files/vubuwesozawo.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210919_2C7ABDF91921B23A.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/xoxizemomenarako.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1612f26ac112b2---kurowibirafatipavikovew.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/natigixorevutuxirujud.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC180 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD997 10964 bytes
SHA-256: 284e9783f5d6a5296dc1af5db57a0d5b8e24143a10e369da180a8d46509e6ef6
font_02_sfnt_off0000f2d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D3 17596 bytes
SHA-256: 96c14011c37caaba30b72d8e46cbbd577483e5cf463d8a1fe6f3f7203242a2ae

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